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Fix linspace implementation (#1358)

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* Fix linspace implementation

`steps` should be strictly greater than 1 to make it consistent with the context.

* Handle steps == 0 and steps == 1.

* Fix rustfmt.

---------

Co-authored-by: laurent <laurent.mazare@gmail.com>
This commit is contained in:
MilkFather
2023-11-23 15:35:13 +08:00
committed by GitHub
parent ec23427d60
commit ca19a9af62
2 changed files with 11 additions and 8 deletions
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17
candle-transformers/src/models/stable_diffusion/utils.rs
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@ -1,12 +1,15 @@
use candle::{Device, Result, Tensor};
pub fn linspace(start: f64, stop: f64, steps: usize) -> Result<Tensor> {
if steps < 1 {
candle::bail!("cannot use linspace with steps {steps} <= 1")
if steps == 0 {
Tensor::from_vec(Vec::<f64>::new(), steps, &Device::Cpu)
} else if steps == 1 {
Tensor::from_vec(vec![start], steps, &Device::Cpu)
} else {
let delta = (stop - start) / (steps - 1) as f64;
let vs = (0..steps)
.map(|step| start + step as f64 * delta)
.collect::<Vec<_>>();
Tensor::from_vec(vs, steps, &Device::Cpu)
}
let delta = (stop - start) / (steps - 1) as f64;
let vs = (0..steps)
.map(|step| start + step as f64 * delta)
.collect::<Vec<_>>();
Tensor::from_vec(vs, steps, &Device::Cpu)
}